body {
    padding-top: 20px;
    background-color: #f8f9fa;
}

.card {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.navbar {
    margin-bottom: 20px;
}

.alert {
    margin-top: 20px;
}

.login-container, .register-container {
    max-width: 500px;
    margin: 0 auto;
    padding: 20px;
    background: #fff;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}